This is filed as Debian bug 511334.I'm in the middle of updating first to the 2.6.24 etchnhalf kernel, and if that succeeds, I'll update this new Etch system to Lenny. I had no trouble with etch module mismatches, but I did have to run fdasd by hand because parted failed to create /dev/dasda1.
Etchnhalf works OK. About to try online update to Lenny. Adam